Hello,
I have a tutorial about MASM32 Programming.

My Tutorial on FuriX.net:
MASM32 Tutorial

About 7 weeks ago My tutorial was on this page (first page at the bottom):
http://www.google.com/search?q=masm32+tutorial

About 3 Weeks ago my tutorial was on this page:
http://www.google.com/search?q=masm3...&start=10&sa=N

Now My tutorial is on this page:
http://www.google.com/search?q=masm3...&start=20&sa=N

As you can see, slowly but surely, my Tutorial has been dropping from the SERPs, and I made absolutely no changes to it, so I don't understand why it happened so fast. Is it because the last 7 weeks like 60 people wrote good tutorials or something? Or is it because few people clicked on my tutorial in the SERPs?

Maybe 60 people didn't write better tutorials in the last week, but got some links to last year's page? The entire web is in a state of flux, changing every second, so for the SERPs to change without you doing anything is like the seasons to change even if you didn't go skiing.

But in 7 weeks? I would expect a decline in 7 months, but 6 weeks? It's a good tutorial, with good SEO practices.